Step 1

Place sugar, ketchup, paprika and Worcestershire sauce in a bowl and stir to combine. Add steak and stir to coat. Set aside to marinate while you make the avocado dressing and pico de gallo.

Step 2

For the avocado dressing, place all the ingredients in a small food processor or blender and whiz until smooth. Season to taste.

Step 3

For the pico de gallo, combine all ingredients in a bowl and season.

Step 4

Heat oil in a large non-stick frypan over medium heat. Season the steak and, in 2 batches, cook for 3-4 minutes, tossing the pan, until steak is just cooked. Set aside to rest for 2-3 minutes.

Step 5

Spread avocado mixture into the taco shells. Add iceberg lettuce, pico de gallo, then top with steak and cheese. Serve immediately.